18. Denver International Airport
Number of passengers: 58,266,515
Finally a familiar name for our American readers, Denver International Airport served over 58 million people last year. However, Denver International Airport is not the busiest airport in the United States nor the last U.S. airport to be featured on the list either. However, it is the largest airport by land area in the U.S. Denver International Airport covers over 33,531 acres (52.4 sq mi) of land and cost almost $5 billion dollars to build. It was originally commissioned for much less money and there are many conspiracy theories surrounding the unique airport.
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